持续随机飞行物体/矩形WPF C＃

Question

我在C＃WPF中创建简单游戏只是为了更多地了解语言。我的目标是创建类似于太空入侵者的游戏。我正在创造敌人，我想从一点到另一点随机飞行。然而，它飞到第一个randomed点，然后继续重复做同样的动作（包括传送到起点，这不是我的观点，你可以猜到）任何人都可以帮助我弄清楚我可以在这里更改/添加什么？这是创建和移动该对象的方法。我不认为这里需要更多的代码（我的意思是整个游戏）。

        public void CreateEnemy()
    {
        Random randomEnemy = new Random();
        Rectangle enemy = new Rectangle();
        var Urii = new Uri("pack://application:,,,/Modele/ufoRed.png");
        enemy.Width = 30;
        enemy.Height = 30;
        ImageBrush enemyImg = new ImageBrush();
        enemyImg.ImageSource = new BitmapImage(Urii);
        enemy.Fill = enemyImg;
        myCanvas.Children.Add(enemy);

        enemy.SetValue(Canvas.LeftProperty, 400d);
        enemy.SetValue(Canvas.TopProperty, 0d);

        Storyboard enemyAnimate = new Storyboard();
        DoubleAnimation enemyAnimation;

        int topRandom = randomEnemy.Next(50, 300);
        int leftRandom = randomEnemy.Next(0, 500);
        //up and down
        enemyAnimation = new DoubleAnimation(topRandom, new Duration(new TimeSpan(0, 0, 0, 5)));
        enemyAnimation.AutoReverse = false;
        Storyboard.SetTarget(enemyAnimation, enemy);
        Storyboard.SetTargetProperty(enemyAnimation, new PropertyPath("(Canvas.Top)"));
        enemyAnimate.Children.Add(enemyAnimation);
        // left and right
        enemyAnimation = new DoubleAnimation(leftRandom, new Duration(new TimeSpan(0, 0, 0, 5)));
        enemyAnimation.AutoReverse = false;
        Storyboard.SetTarget(enemyAnimation, enemy);
        Storyboard.SetTargetProperty(enemyAnimation, new PropertyPath("(Canvas.Left)"));
        enemyAnimate.Children.Add(enemyAnimation);
        enemyAnimation.RepeatBehavior = RepeatBehavior.Forever;
        enemyAnimate.Begin();
    }

问候， kim0z